Importance

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Abstract

There is provided a hologram engine for calculating a hologram of a target picture for displaying on a display device of an optical system. The target picture comprises a plurality of image points. Each image point is defined by a light-ray path therefrom to an entrance pupil of a viewer. Each light-ray path makes an angle with the display device. The hologram engine is arranged to determine a first sub-hologram of a first subset of the image points of the target picture by, for each image point of the first subset: a) propagating a wave along a propagation path that makes an angle with the display device that is reduced relative to the angle made by the respective light-ray path; and b) determining a contribution of the wave at the display device for each image point of the first subset.

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First Claim